14 / 140 14 0 en iso 2503 class 3 200 bar 10 bar q u a l i t y d1 aa there are three different o-rings for ht connection. acetylene small black o-ring, same as previous version. fits in both new and earlier ht connections. oxygen, mison ® and argon mixtures → small (n10.3 x 2.4 mm) green or black o-ring only fits in the earlier ht connection → large (n11.3 x 2.4 mm) black o-ring is intended for the new ht connection with brass nut parts of the
